That annoying thing when you wake up pre-dawn and two hours later it's still pre-dawn and you realise you're 12 hours out.
And then two hours later realise it's not the day you thought it was either.
I had to check the modification date on a file I knew I saved earlier to confirm I haven't entirely missed Friday, which means I was so tired Thursday and Friday have merged together in my head. I can vaguely remember thinking I must check Friday's webcomics, which is more confirmation, but I don't think I managed to actually do that. It also explains why there was one less helping of soup in the fridge than I expected at lunchtime.
I can sort of piece it together, Thurday night's sleep was more two or three hours trying to doze followed by eventually giving up and going downstairs, rather than actual sleep, but that led to a crash-dive onto the couch sometime late-afternoon, and staggering to bed sometime after dark. When I woke up and the alarm said 6:30 I definitely thought that was AM, not PM, so at this point I'm really, really glad I rolled over and slept another hour.
But that still means I may only have had 4 hours sleep in the last 56(?) hours.
I'm not sure I'll manage to get back into a proper sleeping rhythm, and at this point I'd even settle for nocturnally awake, until I'm rid of this damned cold, which is clinging on by the claws in the back of my throat and proving annoyingly difficult to get rid of. It's really not much more than sniffles and a cough, but just enough to disturb you as you drift towards sleep.